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Array.from vs new Array2000
(version: 0)
Comparing performance of:
Array.from vs new Array
Created:
5 years ago
by:
Guest
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Tests:
Array.from
Array.from({ length: 1000 }, () => new Array(1000).fill(0));
new Array
new Array(1000).fill(0).map(() => new Array(1000).fill(0));
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Suite status:
<idle, ready to run>
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Test case name
Result
Array.from
new Array
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, compared, and some pros and cons of each approach. **Benchmark Overview** The benchmark compares two ways to create an array with 2000 elements filled with zeros in JavaScript: 1. **Array.from**: A method that creates a new array from an iterable or an array-like object. 2. **new Array(1000).fill(0)`: A constructor call that creates a new array and fills it with the specified number of zero values. **Test Case Comparison** The benchmark has two test cases: 1. **Array.from**: The first test case creates a new array from an array-like object using `Array.from()`. 2. **new Array(1000).fill(0)`: The second test case uses the constructor call to create a new array and fill it with 1000 zero values. **Pros and Cons** * **Array.from**: This approach is generally faster because it avoids creating a temporary array of zeros. * **Advantages:** More memory-efficient, potentially faster execution. * **Disadvantages:** May have higher overhead due to the creation of an iterator object. * **new Array(1000).fill(0)`: This approach creates a new array with 2000 elements filled with zeros, which might be slower than creating only one array and reusing it. * **Advantages:** Creates a single array that can be reused in the future. * **Disadvantages:** Requires more memory, potentially slower execution. **Library Usage** The benchmark uses no external libraries. However, if we were to use such libraries like Lodash or Ramda to implement these methods, it could impact the results of the test case as they have their own overhead and performance characteristics. **Special JavaScript Features/Syntax** There are no special JavaScript features or syntax being used in this benchmark. **Alternative Approaches** In addition to the provided methods (Array.from() and new Array(1000).fill(0)), other approaches could be: * **Array.prototype.fill()**: This method fills all elements of an existing array with a specified value. While it might seem like a good alternative, it would require creating an initial array before filling it. * **Map or Set**: Creating a Map or Set with 2000 zeros and converting it to an array could be another way to fill the array. Keep in mind that each approach has its own trade-offs, and performance differences between them may vary depending on specific use cases.
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Array.from() vs new A
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